M13-Widefield

IMAGE DETAILS

Object ............................................  Hercules Great Globular Cluster (M13)
Constellation ..............................   Hercules
RA / DEC ..................................... 16h:41m.41sec / +36 27m.35sec
Distance + Ap. Magnitude.........  25.100  Light years  /  5.8
Date + Time ...............................   04/07/2018 - 19:10 UTC
Location ....................................   
"Nunki Observatory" - Skiathos
Optics .........................................    Officina Stellare Advanced RILA 400 f/5.25
Mount .......................................     Paramount ME
Camera .....................................   SBIG STXL11002  with FW8G-STXL (Astrodon filters)
Exposure Time.......................     l: 30X 60 sec , RGB : 30X 60sec

Guiding ....................................    Unguided
Processing Details ..................   ACP , Maxim , Photoshop CC
More Details ...........................    Environment Temperature : 25 oC Camera Temperature -30 οC
Sky temperature .....................   7.0. οC
Notes ........................................   Weather: Clear  Transparence: 
Medium  Humidity : 75 % 
Moon Illumination ...............    82%


Target details .........................   
Messier 13 (M13), also designated NGC 6205 and sometimes called the Great Globular Cluster in Hercules or the Hercules Globular Cluster, is a globular cluster of about 300,000 stars in theconstellation of Hercules.
M13 was discovered by Edmond Halley in 1714, and catalogued by Charles Messier on June 1, 1764.
It is barely visible with the naked eye on a very clear night. Its diameter is about 23 arc minutes and it is readily viewable in small telescopes.

M13 is about 145 light-years in diameter, and it is composed of several hundred thousand stars, the brightest of which is the variable star V11 with an apparent magnitude of 11.95. M13 is 25,100 light-years away from Earth
The Arecibo message of 1974, containing encoded information about human race, DNA, atomic numbers, Earth position, was beamed there for being picked up by a potential extraterrestrial civilization. It will reach the cluster in 25,100 years.
 

Nikos Paschalis